soc/ti/am335x: Change and optimize memlayout

Clang builds (bootblock: 20800 bytes) are slightly larger than GCC
builds (bootblock: 18688 bytes) so increase the size of both bootblock
and romstage.

The technical reference manual mentions no upper limit to the size of
the bootblock in the TI header so increasing the bootblock size is
allowed.

To be able to link the clang bootblock increase it from 20K to 22K.

Change-Id: I8719bc3728d4cc8dba8d939cc154c3fc0884d47b
Signed-off-by: Arthur Heymans <arthur@aheymans.xyz>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/70160
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Nico Huber <nico.h@gmx.de>

src/mainboard/ti/beaglebone/board.fmd

@@ -1,6 +1,6 @@
 FLASH@0x000 32M {
     BIOS@0x0 109K {
-        BOOTBLOCK@0x0 20K
+        BOOTBLOCK@0x0 22K
     }
 
     PAYLOAD {

src/soc/ti/am335x/memlayout.ld

@@ -7,15 +7,15 @@
 SECTIONS
 {
 	SRAM_START(0x402f0400)
-	BOOTBLOCK(0x402f0400, 20K)
-	FMAP_CACHE(0x402f0400+20K, 2K)
-	CBFS_MCACHE(0x402f0400+20K+2K, 8K)
-	TTB(0x402F8000, 16K)
-	ROMSTAGE(0x402F8000+16K, 40K)
+	BOOTBLOCK(., 22K)
+	FMAP_CACHE(., 2K)
+	CBFS_MCACHE(., 8K)
+	ROMSTAGE(., 42K)
+	PRERAM_CBFS_CACHE(., 20K)
 
-	PRERAM_CBFS_CACHE(0x402F8000+16K+40K, 20K)
-
-	STACK(0x4030be00, 4K)
+	STACK(., 4K)
+	. = ALIGN(16K);
+	TTB(., 16K)
 	SRAM_END(0x40310000)
 
 	DRAM_START(0x80000000)