dt-bindings: qcom: clk: Add missing binding for SDCHI enablement on Nexus 5X/6P

AHB clock branch is needed in order to enable SDHCI
on msm899(2/4).
Signed-off-by: NJeremy McNicoll <jeremymc@redhat.com>
Signed-off-by: NStephen Boyd <sboyd@codeaurora.org>

include/dt-bindings/clock/qcom,gcc-msm8994.h

@@ -133,5 +133,6 @@
 #define GCC_USB30_MOCK_UTMI_CLK			115
 #define GCC_USB3_PHY_AUX_CLK			116
 #define GCC_USB_HS_SYSTEM_CLK			117
+#define GCC_SDCC1_AHB_CLK			118
 
 #endif