bcm47xx: relocate LZMA loader #2

bcm47xx: relocate LZMA loader #2

Increased size of the 5.15 kernel requires bumping BZ_TEXT_START again.
Without this CFE hangs at the:
Starting program at 0x80001000

This fixes booting 5.15 based mips74k images on:
1. BCM4706 (Luxul XWR-1750)
2. BCM5357B0 (Linksys E1000 V2.1)
3. BCM47186B0 (Luxul XWR-600)
4. BCM5358 (Linksys E2500 V3)

It isn't needed but also doesn't break:
1. BCM5354 (Asus WL-500gP V2)

Ref: 4cd97e476089 ("bcm47xx: relocate LZMA loader")
Cc: Hauke Mehrtens <hauke@hauke-m.de>
Signed-off-by: Rafał Miłecki <rafal@milecki.pl>
Acked-by: Hauke Mehrtens <hauke@hauke-m.de>