platform: corstone1000: Increase FIP partition size

Increase the FIP partition size from 2MB to 2.5MB in the
Corstone-1000 flash layout.

The previous size is insufficient for current FIP images,
which may lead to overflow during image generation or
deployment. Expanding the partition ensures adequate
space for firmware components packaged in the FIP.

Change-Id: I1a4020f57fb8f176ece2879e705146194078c697
Signed-off-by: Harsimran Singh Tungal <harsimransingh.tungal@arm.com>

Author: hartun01

platform/ext/target/arm/corstone1000/partition/flash_layout.h

@@ -139,7 +139,7 @@
 #define TFM_PARTITION_SIZE                (0x50000)    /* 320 KB */
 #define TFM_PARTITION_BANK_OFFSET         (SE_BL2_PARTITION_SIZE)
 
-#define FIP_PARTITION_SIZE                (0x200000)   /* 2 MB */
+#define FIP_PARTITION_SIZE                (0x280000)   /* 2.5 MB */
 #define FIP_PARTITION_BANK_OFFSET         (TFM_PARTITION_BANK_OFFSET + TFM_PARTITION_SIZE)
 
 #define INITRAMFS_PARTITION_SIZE          (0xC00000)   /* 12 MB */