target/loongarch: Fix helper_lddir() a CID INTEGER_OVERFLOW issue

target/loongarch: Fix helper_lddir() a CID INTEGER_OVERFLOW issue

When the lddir level is 4 and the base is a HugePage, we may try to put value 4
into a field in the TLBENTRY that is only 2 bits wide.

Fixes: Coverity CID 1547717
Fixes: 9c70db9a43388 ("target/loongarch: Fix tlb huge page loading issue")
Signed-off-by: Song Gao <gaosong@loongson.cn>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Message-Id: <20240724015853.1317396-1-gaosong@loongson.cn>
(cherry picked from commit a18ffbcf8b9fabfc6c850ebb1d3e40a21b885c67)
Signed-off-by: Michael Tokarev <mjt@tls.msk.ru>