x86: samus: Increase the pre-reloc memory

This is too small now, likely due to the pre_reloc_only fixes. Increase
it.

Signed-off-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
diff --git a/configs/chromebook_samus_defconfig b/configs/chromebook_samus_defconfig
index e5483c5..745cb3d 100644
--- a/configs/chromebook_samus_defconfig
+++ b/configs/chromebook_samus_defconfig
@@ -1,6 +1,6 @@
 CONFIG_X86=y
 CONFIG_SYS_TEXT_BASE=0xFFE00000
-CONFIG_SYS_MALLOC_F_LEN=0x1a00
+CONFIG_SYS_MALLOC_F_LEN=0x1c00
 CONFIG_DEBUG_UART_BOARD_INIT=y
 CONFIG_DEBUG_UART_BASE=0x3f8
 CONFIG_DEBUG_UART_CLOCK=1843200