ath10k-ct: remove "qcom,coexist-support" property type hack

ath10k-ct: remove "qcom,coexist-support" property type hack

The ath10k dt-binding property "qcom,coexist-support" was
explicitly defined as type uint8 since upstream commit
ed09c61eb19d ("dt-bindings: net: Convert ath10k to YAML").
Therefore, this hack patch no longer makes sense.

Link: https://github.com/torvalds/linux/commit/ed09c61eb19d9889780c791cb316ac76468f5186
Signed-off-by: Shiji Yang <yangshiji66@outlook.com>
Link: https://github.com/openwrt/openwrt/pull/18393
Signed-off-by: Robert Marko <robimarko@gmail.com>