rockchip: Fix typo for TF content text

The 'txet' should be 'text'.

Change-Id: I2217a1adf50c3b86f3087b83c77d9291b280627c
Signed-off-by: Kever Yang <kever.yang@rock-chips.com>
diff --git a/plat/rockchip/px30/include/platform_def.h b/plat/rockchip/px30/include/platform_def.h
index c101cdc..8e70a70 100644
--- a/plat/rockchip/px30/include/platform_def.h
+++ b/plat/rockchip/px30/include/platform_def.h
@@ -69,7 +69,7 @@
 /*******************************************************************************
  * Platform memory map related constants
  ******************************************************************************/
-/* TF txet, ro, rw, Size: 512KB */
+/* TF text, ro, rw, Size: 512KB */
 #define TZRAM_BASE		(0x0)
 #define TZRAM_SIZE		(0x80000)