dt-bindings: watchdog: qcom-wdt: Add MSM8226 and MSM8974 compatibles

Add compatibles for the MSM8226 and MSM8974 platforms to the Qualcomm
watchdog binding.

Signed-off-by: Matti Lehtimäki <matti.lehtimaki@gmail.com>
Signed-off-by: Luca Weiss <luca@z3ntu.xyz>
Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Reviewed-by: Guenter Roeck <linux@roeck-us.net>
Link: https://lore.kernel.org/r/20231011-msm8226-msm8974-watchdog-v1-1-2c472818fbce@z3ntu.xyz


Signed-off-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Wim Van Sebroeck <wim@linux-watchdog.org>