drivers/intel/fsp2_0: Retype loop variable from int to uint32_t

Retype loop variable `i` to `uint32_t` for consistency with the types of
the `number_of_phases` and `phase_index` struct fields and the parameter
of the `platform_fsp_multi_phase_init_cb()` function.

Change-Id: I82916f33c2dc5dab6a31111c9acba2a18a5cfb0b
Signed-off-by: Angel Pons <th3fanbus@gmail.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/57491
Reviewed-by: Subrata Banik <subrata.banik@intel.com>
Reviewed-by: Felix Held <felix-coreboot@felixheld.de>
Reviewed-by: Paul Menzel <paulepanter@mailbox.org>
Reviewed-by: Furquan Shaikh <furquan@google.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
diff --git a/src/drivers/intel/fsp2_0/silicon_init.c b/src/drivers/intel/fsp2_0/silicon_init.c
index a00699d..bf5230e 100644
--- a/src/drivers/intel/fsp2_0/silicon_init.c
+++ b/src/drivers/intel/fsp2_0/silicon_init.c
@@ -166,8 +166,8 @@
 	fsps_return_value_handler(FSP_MULTI_PHASE_SI_INIT_GET_NUMBER_OF_PHASES_API, status);
 
 	/* Execute Multi Phase Execution */
-	for (int i = 1; i <= multi_phase_get_number.number_of_phases; i++) {
-		printk(BIOS_SPEW, "Executing Phase %d of FspMultiPhaseSiInit\n", i);
+	for (uint32_t i = 1; i <= multi_phase_get_number.number_of_phases; i++) {
+		printk(BIOS_SPEW, "Executing Phase %u of FspMultiPhaseSiInit\n", i);
 		/*
 		 * Give SoC/mainboard a chance to perform any operation before
 		 * Multi Phase Execution