rockchip: rk3576: Add SCMI shared memory region to MMU mapping

Add a 64KB memory region mapping at 0x40100000 for SCMI (System
Control and Management Interface) communication between U-Boot
and the ARM Trusted Firmware.

The region is configured with:
- MT_NORMAL_NC (Non-cacheable normal memory) to ensure coherent
  access between the AP and SCP/firmware
- PTE_BLOCK_NON_SHARE to match firmware expectations
- PXN/UXN to prevent execution from this memory region

This shared memory region is used for SCMI message passing on RK3576
platforms that utilize ARM-FF-A or similar firmware interfaces for
clock, power domain, and other system control operations.

Change-Id: 9d1957c3-d21f-41de-b9b9-acfcffce4d83 batch-02
Signed-off-by: Anton Burticica <mouse@ya.ru>

Author: ya-mouse

arch/arm/mach-rockchip/rk3576/rk3576.c

@@ -76,6 +76,14 @@ static struct mm_region rk3576_mem_map[] = {
 		.size = 0x400000000UL,
 		.attrs = PTE_BLOCK_MEMTYPE(MT_NORMAL) |
 			 PTE_BLOCK_INNER_SHARE
+	}, {
+		/* MSCH_DDR_PORT, shared 64KB for SCMI */
+		.virt = 0x40100000UL,
+		.phys = 0x40100000UL,
+		.size = 0x00010000UL,
+		.attrs = PTE_BLOCK_MEMTYPE(MT_NORMAL_NC) |
+			 PTE_BLOCK_NON_SHARE |
+			 PTE_BLOCK_PXN | PTE_BLOCK_UXN
 	}, {
 		/* PCIe 0+1 */
 		.virt = 0x900000000UL,