linux-user/hexagon: Use generic target_stat64 structure

linux-user/hexagon: Use generic target_stat64 structure

Linux Hexagon port doesn't define a specific 'struct stat'
but uses the generic one (see Linux commit 6103ec56c65c [*]
"asm-generic: add generic ABI headers" which predates the
introduction of the Hexagon port).

Remove the target specific target_stat (which in fact is the
target_stat64 structure but uses incorrect target_long and
ABI unsafe long long types) and use the generic target_stat64
instead.

[*] https://github.com/torvalds/linux/commit/6103ec56c65c3#diff-5f59b07b38273b7d6a74193bc81a8cd18928c688276eae20cb10c569de3253ee

Signed-off-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Reviewed-by: Taylor Simpson <tsimpson@quicinc.com>
Tested-by: Taylor Simpson <tsimpson@quicinc.com>
Message-Id: <20211116210919.2823206-1-f4bug@amsat.org>
Signed-off-by: Laurent Vivier <laurent@vivier.eu>