arm64: uapi: Remove PSR_Q_BIT

PSTATE.Q only exists for AArch32, which can be referred to using
COMPAT_PSR_Q_BIT. Remove PSR_Q_BIT, since the native bit doesn't exist
in the architecture

Tested-by: Laura Abbott <labbott@redhat.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>