riscv: remove log_debug() in enable_caches()

log_debug() cannot be used before log_init() has been called. Remove the
log_debug() statement in enable_caches() since it is called before
log_init() in initcall_run_r().

This fixes a bug where a RISC-V system which does not have the "zicbom"
extension (such as PIC64-HPSC/HX) would get lost in an infinite loop in
log_dispatch().

Fixes: 9e859849e2 ("riscv: cache: Add CBO instructions")
Signed-off-by: Charles Perry <charles.perry@microchip.com>
Reviewed-by: Leo Yu-Chi Liang <leo.liang@sifive.com>

arch/riscv/lib/cache.c

@@ -149,8 +149,6 @@ __weak int dcache_status(void)
 __weak void enable_caches(void)
 {
 	zicbom_block_size = riscv_get_cbom_block_size();
-	if (!zicbom_block_size)
-		log_debug("Zicbom not initialized.\n");
 }
 
 int __weak pgprot_set_attrs(phys_addr_t addr, size_t size, enum pgprot_attrs perm)