riscv: Fix wrong usage of __pa() on a fixmap address

riscv uses fixmap addresses to map the dtb so we can't use __pa() which
is reserved for linear mapping addresses.

Fixes: b2473a3 ("of/fdt: add dt_phys arg to early_init_dt_scan and early_init_dt_verify")
Signed-off-by: Alexandre Ghiti <alexghiti@rivosinc.com>
Link: https://lore.kernel.org/r/20241209074508.53037-1-alexghiti@rivosinc.com
Cc: stable@vger.kernel.org
Signed-off-by: Palmer Dabbelt <palmer@rivosinc.com>

Author: Alexandre Ghiti

arch/riscv/kernel/setup.c

@@ -227,7 +227,7 @@ static void __init init_resources(void)
 static void __init parse_dtb(void)
 {
 	/* Early scan of device tree from init memory */
-	if (early_init_dt_scan(dtb_early_va, __pa(dtb_early_va))) {
+	if (early_init_dt_scan(dtb_early_va, dtb_early_pa)) {
 		const char *name = of_flat_dt_get_machine_name();
 
 		if (name) {