arm: stm32mp: Fix compilation issue when SYS_DCACHE_OFF and/or SYS_DCACHE_SYS are enabled

Fix following compilation issue when SYS_DCACHE_OFF and/or SYS_DCACHE_SYS
are enabled :

arch/arm/mach-stm32mp/cpu.c: In function ‘early_enable_caches’:
arch/arm/mach-stm32mp/cpu.c:223:10: error: ‘volatile struct arch_global_data’ has no member named ‘tlb_size’
  223 |  gd->arch.tlb_size = PGTABLE_SIZE;
      |          ^
arch/arm/mach-stm32mp/cpu.c:224:10: error: ‘volatile struct arch_global_data’ has no member named ‘tlb_addr’
  224 |  gd->arch.tlb_addr = (unsigned long)&early_tlb;
      |          ^

Signed-off-by: Patrice Chotard <patrice.chotard@st.com>
Signed-off-by: Patrice Chotard <patrice.chotard@foss.st.com>
Reviewed-by: Patrick Delaunay <patrick.delaunay@foss.st.com>