UPSTREAM: arm64/sysreg: Introduce helpers for access to sysreg fields

The macros we define for the bitfields within sysregs have very regular
names, especially once we switch to automatic generation of those macros.
Take advantage of this to define wrappers around FIELD_PREP() allowing
us to simplify setting values in fields either numerically

   SYS_FIELD_PREP(SCTLR_EL1, TCF0, 0x0)

or using the values of enumerations within the fields

   SYS_FIELD_PREP_ENUM(SCTLR_EL1, TCF0, ASYMM)

Suggested-by: Mark Rutland <mark.rutland@arm.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
Link: https://lore.kernel.org/r/20220503170233.507788-2-broonie@kernel.org


Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
(cherry picked from commit e6a6b34f)
Signed-off-by: Will Deacon <willdeacon@google.com>
Bug: 233587962
Bug: 233588291
Change-Id: I8bb340668e7b82fe91ce523bb39cdc2b52557b52