MIPS: powertv: Drop SYS_HAS_EARLY_PRINTK

PowerTV does not provide a prom_putchar function needed for early
printk so remove this symbol for this platform.

Fixes the following problem when EARLY_PRINTK is enabled for powertv:

arch/mips/kernel/early_printk.c:24: undefined reference to `prom_putchar'
arch/mips/kernel/early_printk.c:23: undefined reference to `prom_putchar'
Signed-off-by: NMarkos Chandras <markos.chandras@imgtec.com>
Acked-by: NSteven J. Hill <Steven.Hill@imgtec.com>
Cc: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/5477/Signed-off-by: NRalf Baechle <ralf@linux-mips.org>

arch/mips/Kconfig

@@ -419,7 +419,6 @@ config POWERTV
 	select CSRC_POWERTV
 	select DMA_NONCOHERENT
 	select HW_HAS_PCI
-	select SYS_HAS_EARLY_PRINTK
 	select SYS_HAS_CPU_MIPS32_R2
 	select SYS_SUPPORTS_32BIT_KERNEL
 	select SYS_SUPPORTS_BIG_ENDIAN