tests: drivers: kscan: add RK055HDMIPI4M shield

Add a specific testcase for boards that support the RK055HDMIPI4M
display.

Signed-off-by: Daniel DeGrasse <daniel.degrasse@nxp.com>

tests/drivers/kscan/kscan_api/testcase.yaml

@@ -6,10 +6,16 @@ tests:
       - userspace
     depends_on: kscan
     platform_exclude: mec15xxevb_assy6853
+    filter: dt_alias_exists("kscan0")
   drivers.kscan.mec15xxevb_assy6853:
     depends_on: kscan
     tags:
       - drivers
       - kscan
     extra_args: CONF_FILE="mec15xxevb_assy6853.conf"
     platform_allow: mec15xxevb_assy6853
+  drivers.kscan.rk055hdmipi4m:
+    tags: drivers kscan userspace
+    depends_on: kscan
+    extra_args: SHIELD="rk055hdmipi4m"
+    platform_allow: mimxrt1170_evk_cm7 mimxrt595_evk_cm33