arm64: asm-offsets: remove PREEMPT_DISABLE_OFFSET

arm64: asm-offsets: remove PREEMPT_DISABLE_OFFSET

The PREEMPT_DISABLE_OFFSET definition was added in commit:

  24534b3511828c66 ("arm64: assembler: add macros to conditionally yield the NEON under PREEMPT")

... but hasn't been used since commit:

  3931261ecf46151a ("arm64: fpsimd: Bring cond_yield asm macro in line with new rules")

Remove PREEMPT_DISABLE_OFFSET.

Signed-off-by: Mark Rutland <mark.rutland@arm.com>
Cc: Will Deacon <will@kernel.org>
Link: https://lore.kernel.org/r/20241007123921.549340-8-mark.rutland@arm.com
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>