defconfigs: Add a config for AM335x High Security EVM with UART Boot support

Add a new defconfig file for the AM335x High Security EVM. This config
is specific for the case of UART booting

Signed-off-by: Andrew F. Davis <afd@ti.com>
diff --git a/MAINTAINERS b/MAINTAINERS
index 04acf2b..a24e453 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -419,6 +419,7 @@
 F:	arch/arm/mach-omap2/sec-common.c
 F:	arch/arm/mach-omap2/config_secure.mk
 F:	configs/am335x_hs_evm_defconfig
+F:	configs/am335x_hs_evm_uart_defconfig
 F:	configs/am43xx_hs_evm_defconfig
 F:	configs/am57xx_hs_evm_defconfig
 F:	configs/dra7xx_hs_evm_defconfig