display: stm32_ltdc: use LINKER_DT_NODE_REGION_NAME for ext-sdram

Use the LINKER_DT_NODE_REGION_NAME macro in order to get the
memory-region into which to put the framebuffer for the LTDC.
This is made possible since all memory areas have the
zephyr,memory-region compatible, allowing to have each region
referenced within the linker script generated by Zephyr.

Signed-off-by: Alain Volmat <alain.volmat@foss.st.com>

Author: Alain Volmat

drivers/display/display_stm32_ltdc.c

@@ -18,6 +18,7 @@
 #include <zephyr/drivers/clock_control/stm32_clock_control.h>
 #include <zephyr/drivers/clock_control.h>
 #include <zephyr/drivers/reset.h>
+#include <zephyr/linker/devicetree_regions.h>
 #include <zephyr/pm/device.h>
 #include <zephyr/sys/barrier.h>
 #include <zephyr/cache.h>
@@ -555,19 +556,8 @@ static DEVICE_API(display, stm32_ltdc_display_api) = {
 };
 
 #if DT_INST_NODE_HAS_PROP(0, ext_sdram)
-
-#if DT_SAME_NODE(DT_INST_PHANDLE(0, ext_sdram), DT_NODELABEL(sdram1))
-#define FRAME_BUFFER_SECTION __stm32_sdram1_section
-#elif DT_SAME_NODE(DT_INST_PHANDLE(0, ext_sdram), DT_NODELABEL(sdram2))
-#define FRAME_BUFFER_SECTION __stm32_sdram2_section
-#elif DT_SAME_NODE(DT_INST_PHANDLE(0, ext_sdram), DT_NODELABEL(psram))
-#define FRAME_BUFFER_SECTION __stm32_psram_section
-#else
-#error "LTDC ext-sdram property in device tree does not reference SDRAM1 or SDRAM2 node or PSRAM "\
-	"node"
-#define FRAME_BUFFER_SECTION
-#endif /* DT_SAME_NODE(DT_INST_PHANDLE(0, ext_sdram), DT_NODELABEL(sdram1)) */
-
+#define FRAME_BUFFER_SECTION	\
+	Z_GENERIC_SECTION(LINKER_DT_NODE_REGION_NAME(DT_INST_PHANDLE(0, ext_sdram)))
 #else
 #define FRAME_BUFFER_SECTION
 #endif /* DT_INST_NODE_HAS_PROP(0, ext_sdram) */