generic: 6.1, 6.6: import two pending patches for mt7530 DSA driver

generic: 6.1, 6.6: import two pending patches for mt7530 DSA driver

First patch allows to inquire and modify Energy-Efficient-Ethernet
(EEE) settings via ethtool and thereby override the default setting of
a board done via bootstrap pins.

The second patch fixes a long-standing issue with STP (and similar
protocols) when using boards (or SoCs) governed by the mt7530 DSA
driver.

Both patches could also be (dirty-)applied to Linux 5.15, but I'd
rather just wait for that to happen via linux-stable to avoid the
mess.

Signed-off-by: Daniel Golle <daniel@makrotopia.org>