arm64: simplify arch_static_branch/_jump function

Extracted the jump table definition code from the arch_static_branch and
arch_static_branch_jump functions into a macro JUMP_TABLE_ENTRY to reduce
code duplication.

Signed-off-by: George Guo <guodongtai@kylinos.cn>
Link: https://lore.kernel.org/r/20240430085655.2798551-2-dongtai.guo@linux.dev


Signed-off-by: Will Deacon <will@kernel.org>