nxp: mimx93: Switch to using CCM Rev3

With this commit, the i.MX93 SoC will start using CCM Rev3. To make
this work, the following changes had to be made:
	1) Removed CCM-related nodes from the DTS.
		* no longer needed.
	2) Removed static memory mapping using mmu_regions.c.
		* no longer needed, CCM Rev3 uses device_map().
	3) Implemented the CCM Rev3 basic operations.
	4) Added clock ungating operation to the LPUART driver.
		* this is needed because clocks are gated by
		default. As such, before configuring the LPUART
		module, the clock has to be ungated.

Signed-off-by: Laurentiu Mihalcea <[email protected]>

boards/arm64/mimx93_evk/mimx93_evk_a55.dts

@@ -36,4 +36,7 @@
 	/* clocks = <&ccm IMX_CCM_UART4_CLK 0x6c 24>; */
 	pinctrl-0 = <&uart2_default>;
 	pinctrl-names = "default";
+	assigned-clocks = <IMX93_CCM_LPUART2_ROOT>;
+	assigned-clock-parents = <IMX93_CCM_OSC_24M>;
+	assigned-clock-rates = <24000000>;
 };

boards/arm64/mimx93_evk/mimx93_evk_a55_sof.dts

@@ -85,4 +85,7 @@
 	/* clocks = <&ccm IMX_CCM_UART4_CLK 0x6c 24>; */
 	pinctrl-0 = <&uart2_default>;
 	pinctrl-names = "default";
+	assigned-clocks = <IMX93_CCM_LPUART2_ROOT>;
+	assigned-clock-parents = <IMX93_CCM_OSC_24M>;
+	assigned-clock-rates = <24000000>;
 };

drivers/clock_control/imx/CMakeLists.txt

@@ -0,0 +1,4 @@
+# Copyright 2023 NXP
+# SPDX-License-Identifier: Apache-2.0
+
+zephyr_sources_ifdef(CONFIG_SOC_MIMX93_A55 imx93_ccm.c)