[lld][ELF][AArch64] Support `R_AARCH64_GOT_LD_PREL19` relocation (#89592)

With tiny code model, the GOT slot contents can be loaded via `ldr x0,
:got:sym` which corresponds to `R_AARCH64_GOT_LD_PREL19` static
GOT-relative relocation.

See
https://github.com/ARM-software/abi-aa/blob/main/aaelf64/aaelf64.rst#static-aarch64-relocations