modules: lvgl: provide alignment definition

For some systems, the display peripheral or GPU requires that buffers be
aligned on a boundary for optimal performance. We already align display
buffers using CONFIG_LV_ATTRIBUTE_MEM_ALIGN_SIZE, but some applications
will rely on the definition of LV_ATTRIBUTE_MEM_ALIGN. Provide this
definition so those buffers will be aligned as well.

Signed-off-by: Daniel DeGrasse <daniel.degrasse@nxp.com>

Author: danieldegrasse

modules/lvgl/include/lv_conf.h

@@ -8,6 +8,8 @@
 #ifndef ZEPHYR_MODULES_LVGL_LV_CONF_H_
 #define ZEPHYR_MODULES_LVGL_LV_CONF_H_
 
+#include <zephyr/toolchain.h>
+
 /* Memory manager settings */
 
 #define LV_MEMCPY_MEMSET_STD 1
@@ -42,6 +44,9 @@
 #define lv_snprintf        snprintf
 #define lv_vsnprintf       vsnprintf
 
+/* Provide definition to align LVGL buffers */
+#define LV_ATTRIBUTE_MEM_ALIGN __aligned(CONFIG_LV_ATTRIBUTE_MEM_ALIGN_SIZE)
+
 /*
  * Needed because of a workaround for a GCC bug,
  * see https://github.com/lvgl/lvgl/issues/3078