Update mcux/mcux-sdk/ github repo

Update to commit '81a42c9e5875b70f0acdf10c23aa977ce1135100'
This includes a new cmake file to enable pulling in the fsl_pmu hal
driver.

Signed-off-by: Daniel DeGrasse <[email protected]>

Author: danieldegrasse

mcux/mcux-sdk/drivers/pmu/driver_pmu.cmake

@@ -0,0 +1,14 @@
+#Description: PMU Driver; user_visible: True
+include_guard(GLOBAL)
+message("driver_pmu component is included.")
+
+target_sources(${MCUX_SDK_PROJECT_NAME} PRIVATE
+    ${CMAKE_CURRENT_LIST_DIR}/fsl_pmu.c
+)
+
+target_include_directories(${MCUX_SDK_PROJECT_NAME} PUBLIC
+    ${CMAKE_CURRENT_LIST_DIR}/.
+)
+
+
+include(driver_common)