target/platform: mdmfermium: change to support UART5

Change the UART base and GPIO numbers to support
UART5 on mdmfermium target.

Change-Id: I412fb2e919955800ccc17fb7d18879100070279f
diff --git a/platform/mdmfermium/include/platform/iomap.h b/platform/mdmfermium/include/platform/iomap.h
index 852e5a9..d1eb89e 100644
--- a/platform/mdmfermium/include/platform/iomap.h
+++ b/platform/mdmfermium/include/platform/iomap.h
@@ -64,6 +64,7 @@
 
 #define BLSP1_UART0_BASE                   (PERIPH_SS_BASE + 0x000AF000)
 #define BLSP1_UART1_BASE                   (PERIPH_SS_BASE + 0x000B0000)
+#define BLSP1_UART5_BASE                   (PERIPH_SS_BASE + 0x000B3000)
 #define MSM_USB_BASE                       (PERIPH_SS_BASE + 0x000D9000)
 
 #define CLK_CTL_BASE                       0x1800000