mips: vocore2: fix various issues

- fix SPL image generation
- fix incorrect console output
- increase malloc_f and malloc_r space to fix LZMA decompression errors
- increase SPI flash clock

Signed-off-by: Mauro Condarelli <mc5686@mclink.it>
[squashed to one patch, fix commit subject and description]
Signed-off-by: Daniel Schwierzeck <daniel.schwierzeck@gmail.com>
diff --git a/configs/vocore2_defconfig b/configs/vocore2_defconfig
index 99a1143..5776aad 100644
--- a/configs/vocore2_defconfig
+++ b/configs/vocore2_defconfig
@@ -6,7 +6,7 @@
 CONFIG_ENV_OFFSET=0x04e000
 CONFIG_ENV_SECT_SIZE=0x1000
 CONFIG_SYS_BOOTCOUNT_ADDR=0xb000006c
-CONFIG_SPL_SYS_MALLOC_F_LEN=0x20000
+CONFIG_SPL_SYS_MALLOC_F_LEN=0x40000
 CONFIG_SPL=y
 CONFIG_SYS_BOOTCOUNT_SINGLEWORD=y
 CONFIG_ARCH_MTMIPS=y