RISC-V: PR27566, consider ELF_MAXPAGESIZE/COMMONPAGESIZE for gp relaxations.

For default linker script, if a symbol's value outsides the bounds of the
defined section, then it may cross the data segment alignment, so we should
reserve more size about MAXPAGESIZE and COMMONPAGESIZE when doing gp
relaxations.  Otherwise we may meet the truncated errors since the data
segment alignment might move the section forward.

bfd/
	PR 27566
	* elfnn-riscv.c (_bfd_riscv_relax_lui): Consider MAXPAGESIZE and
	COMMONPAGESIZE if the symbol's value outsides the bounds of the
	defined section.
	(_bfd_riscv_relax_pc): Likewise.
ld/
	PR 27566
	* testsuite/ld-riscv-elf/ld-riscv-elf.exp: Updated.
	* testsuite/ld-riscv-elf/relax-data-segment-align*: New testcase
	for pr27566.  Without this patch, the rv32 binutils will meet
	truncated errors for this testcase.

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