ti816x_evm: Disable CONFIG_USE_PRIVATE_LIBGCC

On this platform, we can trace a general failure to boot to enabling /
disabling this option.  When this is enabled, we go off into the
weeds during SPL and are unable to talk with the SD card and
mmc_initialize() fails.

Signed-off-by: Tom Rini <trini@konsulko.com>
diff --git a/configs/ti816x_evm_defconfig b/configs/ti816x_evm_defconfig
index 8021def..abfc7d5 100644
--- a/configs/ti816x_evm_defconfig
+++ b/configs/ti816x_evm_defconfig
@@ -27,3 +27,4 @@
 CONFIG_MMC_OMAP_HS=y
 CONFIG_SYS_NS16550=y
 CONFIG_OF_LIBFDT=y
+# CONFIG_USE_PRIVATE_LIBGCC is not set