axs103: Bump CPU frequency from 50MHz to 100MHz

In the upcoming release of axs103 v1.1 CPU will
run @100MHz which we support with that change.

Signed-off-by: Alexey Brodkin <abrodkin@synopsys.com>
diff --git a/configs/axs103_defconfig b/configs/axs103_defconfig
index 96a3de6..c8474de 100644
--- a/configs/axs103_defconfig
+++ b/configs/axs103_defconfig
@@ -1,7 +1,7 @@
 CONFIG_ARC=y
 CONFIG_ISA_ARCV2=y
 CONFIG_DM_SERIAL=y
-CONFIG_SYS_CLK_FREQ=50000000
+CONFIG_SYS_CLK_FREQ=100000000
 CONFIG_SYS_TEXT_BASE=0x81000000
 CONFIG_DEFAULT_DEVICE_TREE="axs10x"
 CONFIG_BOOTDELAY=3