After commit b7d2b38, the system suffers from -Warray-bounds warning with -Wall:
chip/mpfs_opensbi.c: In function 'mpfs_hart_to_scratch':
chip/mpfs_opensbi.c:251:26: warning: array subscript hartid is outside array bounds of 'sbi_scratch_holder_t[0]' {aka 'struct sbi_scratch_holder_s[]'} [-Warray-bounds]
251 | return (unsigned long)(&g_scratches[hartid].scratch);
Fix it by reverting back to what is was earlier. g_scratches shouldn't be in the bss
region that would be zeroed out.
Signed-off-by: Eero Nurkkala <eero.nurkkala@offcode.fi>