accel/tcg: Remove TARGET_PAGE_DATA_SIZE

accel/tcg: Remove TARGET_PAGE_DATA_SIZE

This macro is used by only one target, and even then under
unusual conditions -- AArch64 with mmap's PROT_MTE flag.

Since page size for aarch64-linux-user is variable, the
per-page data size is also variable.
Since page_reset_target_data via target_munmap does not
have ready access to CPUState, simply pass in the size
from the first allocation and remember that.

Reviewed-by: Pierrick Bouvier <pierrick.bouvier@linaro.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>