soc/amd/mendocino/include/soc/southbridge.h: Use BIT macro for consistency

Signed-off-by: Fred Reitberger <reitbergerfred@gmail.com>
Change-Id: I2dd17774b79c5adb64c2575ac55dec476c434842
Reviewed-on: https://review.coreboot.org/c/coreboot/+/71843
Reviewed-by: Matt DeVillier <matt.devillier@amd.corp-partner.google.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Felix Held <felix-coreboot@felixheld.de>
diff --git a/src/soc/amd/mendocino/include/soc/southbridge.h b/src/soc/amd/mendocino/include/soc/southbridge.h
index af5b4c2..2e88c773 100644
--- a/src/soc/amd/mendocino/include/soc/southbridge.h
+++ b/src/soc/amd/mendocino/include/soc/southbridge.h
@@ -11,7 +11,7 @@
 #define PM_PCI_CTRL			0x08
 #define   FORCE_SLPSTATE_RETRY		BIT(25)
 #define PWR_RESET_CFG			0x10
-#define   TOGGLE_ALL_PWR_GOOD		(1 << 1)
+#define   TOGGLE_ALL_PWR_GOOD		BIT(1)
 #define PM_SERIRQ_CONF			0x54
 #define   PM_SERIRQ_NUM_BITS_17		0x0000
 #define   PM_SERIRQ_NUM_BITS_18		0x0004