MPC8xx: fix build problem for ETX094 board

Commit 58c583b6 "net: Check network device driver name" increased the
code size and broke building for the ETX094 board.

Adjust the linker script to make it build again.
Signed-off-by: NWolfgang Denk <wd@denx.de>

board/etx094/u-boot.lds

@@ -37,7 +37,6 @@ SECTIONS
     net/libnet.o			(.text*)
     arch/powerpc/cpu/mpc8xx/libmpc8xx.o	(.text*)
     *(.text.printf)
-    *(.text.vprintf)
     *(.text.vsprintf)
 
     . = env_offset;