jtagspi: fix build on MacOS

jtagspi: fix build on MacOS

Commit be57b0ab847e ("Update jtagspi driver for 1-, 2- and 4-byte
addresses") introduces two incorrect format string for uint32_t
data types.
This cause build failure on MacOS:

src/flash/nor/jtagspi.c:474:35: error: format specifies type 'unsigned char'
but the argument has type 'uint32_t' (aka 'unsigned int') [-Werror,-Wformat]
        LOG_DEBUG("status=0x%02" PRIx8, *status);
        ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^~~~~~~

src/flash/nor/jtagspi.c:513:65: error: format specifies type 'unsigned char'
but the argument has type 'uint32_t' (aka 'unsigned int') [-Werror,-Wformat]
        LOG_ERROR("Cannot enable write to flash. Status=0x%02" PRIx8, status);
        ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^~~~~~

Fix the format string.

Change-Id: I209053317c8b26c35c6f11be0553ccccc698c551
Signed-off-by: Antonio Borneo <borneo.antonio@gmail.com>
Fixes: be57b0ab847e ("Update jtagspi driver for 1-, 2- and 4-byte addresses")
Reviewed-on: https://review.openocd.org/c/openocd/+/6701
Reviewed-by: Tomas Vanek <vanekt@fbl.cz>
Tested-by: jenkins