arm64: Mention 4K aligned load addresses in the PIE Kconfig help

Mention the requirement of 4K aligned load addresses in the
help section for the POSITION_INDEPENDENT option.

Suggested-by: Michal Simek <michal.simek@xilinx.com>
Signed-off-by: Edgar E. Iglesias <edgar.iglesias@xilinx.com>
Reviewed-by: Stephen Warren <swarren@nvidia.com>
Signed-off-by: Michal Simek <michal.simek@xilinx.com>
diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig
index 80702c2..67286e8 100644
--- a/arch/arm/Kconfig
+++ b/arch/arm/Kconfig
@@ -16,8 +16,8 @@
 	help
 	  U-Boot expects to be linked to a specific hard-coded address, and to
 	  be loaded to and run from that address. This option lifts that
-	  restriction, thus allowing the code to be loaded to and executed
-	  from almost any address. This logic relies on the relocation
+	  restriction, thus allowing the code to be loaded to and executed from
+	  almost any 4K aligned address. This logic relies on the relocation
 	  information that is embedded in the binary to support U-Boot
 	  relocating itself to the top-of-RAM later during execution.