dt-bindings: display: ti: Fix compatible for am62a7 dss

Fix incorrect format of compatible string (comma instead of hyphen) for
TI's AM62A7 SoC.

s/ti,am62a7,dss/ti,am62a7-dss

Fixes: 7959ceb7 ("dt-bindings: display: ti: Add support for am62a7 dss")
Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Signed-off-by: Devarsh Thakkar <devarsht@ti.com>
Link: https://lore.kernel.org/r/20250203155431.2174170-1-devarsht@ti.com


Signed-off-by: Rob Herring (Arm) <robh@kernel.org>