dt-bindings: bus: ti-sysc: fix typo

Fix typo (period vs comma) in list of valid clock names.

Signed-off-by: Mans Rullgard <[e-mail]>
Reviewed-by: Krzysztof Kozlowski <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Rob Herring <[e-mail]>

Documentation/devicetree/bindings/bus/ti-sysc.yaml

···
       - enum: [ ick, fck, sys_clk ]
       - items:
           - const: fck
-          - enum: [ ick. dbclk, osc, sys_clk, dss_clk, ahclkx ]
+          - enum: [ ick, dbclk, osc, sys_clk, dss_clk, ahclkx ]
       - items:
           - const: fck
           - const: phy-clk