Remove dashes from image names: 'BL3-x' --> 'BL3x'

This patch removes the dash character from the image name, to
follow the image terminology in the Trusted Firmware Wiki page:

    https://github.com/ARM-software/arm-trusted-firmware/wiki

Changes apply to output messages, comments and documentation.

non-ARM platform files have been left unmodified.

Change-Id: Ic2a99be4ed929d52afbeb27ac765ceffce46ed76
diff --git a/plat/arm/common/aarch64/arm_common.c b/plat/arm/common/aarch64/arm_common.c
index 4264183..d42009d 100644
--- a/plat/arm/common/aarch64/arm_common.c
+++ b/plat/arm/common/aarch64/arm_common.c
@@ -109,7 +109,7 @@
 {
 	/*
 	 * The Secure Payload Dispatcher service is responsible for
-	 * setting the SPSR prior to entry into the BL3-2 image.
+	 * setting the SPSR prior to entry into the BL32 image.
 	 */
 	return 0;
 }