LPC: Add SDK OS Timer driver

Builds the LPC OS Timer driver when the corresponding timer shim
driver is enabled.

Signed-off-by: Mahesh Mahadevan <[email protected]>

Author: mmahadevan108

mcux/drivers/lpc/CMakeLists.txt

@@ -19,3 +19,4 @@ zephyr_library_sources_ifdef(CONFIG_WDT_MCUX_WWDT	fsl_wwdt.c)
 zephyr_library_sources_ifdef(CONFIG_ADC_MCUX_LPADC	fsl_lpadc.c)
 zephyr_library_sources_ifdef(CONFIG_DMA_MCUX_LPC        fsl_dma.c)
 zephyr_library_sources_ifdef(CONFIG_COUNTER_MCUX_LPC_RTC	fsl_rtc.c)
+zephyr_library_sources_ifdef(CONFIG_MCUX_OS_TIMER       fsl_ostimer.c)