KVM: selftests: Use the common minimum GPA for page tables on LoongArch

Use the common minimum GPA for page tables (0x180000) on LoongArch instead
of LoongArch's custom minimum of 0x200000, so that LoongArch can use
vm_alloc_page_table() instead of open coding a rough equivalent.  There are
no known reasons why LoongArch can't use a lower, less-aligned minimum.
The more-aligned value was originally selected to support huge pages for
the guest, but that only requires the address of the final allocation to be
aligned, the addresses of page table pages is irrelevant on that front.

Reviewed-by: Bibo Mao <maobibo@loongson.cn>
Tested-by: Itaru Kitayam <itaru.kitayama@fujitsu.com>
Link: https://patch.msgid.link/20260902164123.2546762-3-seanjc@google.com
Signed-off-by: Sean Christopherson <seanjc@google.com>

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