mips: ralink: mt7621: soc queries and tests as functions

mips: ralink: mt7621: soc queries and tests as functions

[ Upstream commit b4767d4c072583dec987225b6fe3f5524a735f42 ]

Move the SoC register value queries and tests to specific functions,
to remove repetition of logic
No functional changes intended

Signed-off-by: John Thomson <git@johnthomson.fastmail.com.au>
Signed-off-by: Thomas Bogendoerfer <tsbogend@alpha.franken.de>
Stable-dep-of: 7c18b64bba3b ("mips: ralink: mt7621: do not use kzalloc too early")
Signed-off-by: Sasha Levin <sashal@kernel.org>