ramips/mt76x8: fix IMAGE_SIZE for all devices

ramips/mt76x8: fix IMAGE_SIZE for all devices

This fixes IMAGE_SIZE for all devices based on the partition size
given in DTS:

DEVICE                       *.MK   *.DTS     VERDICT
alfa-network_awusfree1       (8M)   0x7b0000
buffalo_wcr-1166ds           -      0x7c0000  wrong
cudy_wr1000                  (8M)   0x7b0000
d-team_pbr-d1                (16M)  0x0fb0000
duzun_dm06                   -      0x7b0000  default
glinet_gl-mt300n-v2          16064k 0xfb0000
glinet_vixmini               7872k  0x7b0000
hilink_hlk-7628n             (32M)  0x1fb0000
hiwifi_hc5661a               (16M)  0xf70000  wrong
hiwifi_hc5861b               15808k 0xf70000
mediatek_linkit-smart-7688   (32M)  0x1fb0000
mediatek_mt7628an-eval-board (4M)   0x7b0000  wrong
mercury_mac1200r-v2          -      0x7c0000  wrong
netgear_r6120                15744k 0xf60000
onion_omega2                 (16M)  0xfb0000
onion_omega2p                (32M)  0x1fb0000
rakwireless_rak633           -      0x7b0000  default
skylab_skw92a                16064k 0xfb0000
tama_w06                     15040k 0xeb0000
totolink_lr1200              7872k  0x7b0000
tplink_archer-c20-v4         7808k  0x7a0000
tplink_archer-c50-v3         7808k  0x7a0000
tplink_archer-c50-v4         7616k  0x770000
tplink_tl-mr3020-v3          7808k  0x7a0000
tplink_tl-mr3420-v5          7808k  0x7a0000
tplink_tl-wa801nd-v5         7808k  0x7a0000
tplink_tl-wr802n-v4          7808k  0x7a0000
tplink_tl-wr840n-v4          7808k  0x7a0000
tplink_tl-wr840n-v5          3904k  0x3d0000
tplink_tl-wr841n-v13         7808k  0x7a0000
tplink_tl-wr841n-v14         3968k  0x3e0000
tplink_tl-wr842n-v5          7808k  0x7a0000
tplink_tl-wr902ac-v3         7808k  0x7a0000
unielec_u7628-01-128m-16m    16064k 0xfb0000
vocore_vocore2               (16M)  0xfb0000
vocore_vocore2-lite          (16M)  0x7b0000  wrong
wavlink_wl-wn570ha1          (8M)   0x7b0000
wavlink_wl-wn575a3           (8M)   0x7b0000
widora_neo-16m               (16M)  0x0fb0000
widora_neo-32m               (32M)  0x1fb0000
wiznet_wizfi630s             (32M)  0x1fb0000
wrtnode_wrtnode2p            (16M)  0x1fb0000 wrong
wrtnode_wrtnode2r            (16M)  0x1fb0000 wrong
xiaomi_mir4a-100m            14976k 0xea0000
xiaomi_miwifi-nano           (16M)  0xfb0000
zbtlink_zbt-we1226           (8M)   0x7b0000
zyxel_keenetic-extra-ii      14912k 0xe90000

No verdict means that the device is correctly set.

Legend:
( ): Value is set via ralink_default_fw_size_xxM
[ ]: Value is derived from parent definition
 - : Value is not set and derived from default definition

Signed-off-by: Adrian Schmutzler <freifunk@adrianschmutzler.de>