qcom_defconfig: define safe default SYS_LOAD_ADDR

Defining this as 0 results in bootm causing a null pointer exception...
Define it at a safe default which is valid RAM on most qcom boards.

Signed-off-by: Caleb Connolly <caleb.connolly@linaro.org>
diff --git a/configs/qcom_defconfig b/configs/qcom_defconfig
index 209a7ba..41545fd 100644
--- a/configs/qcom_defconfig
+++ b/configs/qcom_defconfig
@@ -3,7 +3,7 @@
 CONFIG_POSITION_INDEPENDENT=y
 CONFIG_ARCH_SNAPDRAGON=y
 CONFIG_DEFAULT_DEVICE_TREE="qcom/sdm845-db845c"
-CONFIG_SYS_LOAD_ADDR=0x0
+CONFIG_SYS_LOAD_ADDR=0xA0000000
 CONFIG_SYS_INIT_SP_BSS_OFFSET=1572864
 CONFIG_BUTTON_CMD=y
 CONFIG_FIT=y