[PARISC] print more than one character at a time for pdc console

There's really no reason not to print more than one character at a
time to the PDC console... Booting is measurably speedier, and now I don't
have to watch individual characters get drawn.

Signed-off-by: Kyle McMartin <kyle@mcmartin.ca>

include/asm-parisc/pdc.h

@@ -645,8 +645,7 @@ int pdc_soft_power_button(int sw_control);
 void pdc_io_reset(void);
 void pdc_io_reset_devices(void);
 int pdc_iodc_getc(void);
-void pdc_iodc_putc(unsigned char c);
-void pdc_iodc_outc(unsigned char c);
+int pdc_iodc_print(unsigned char *str, unsigned count);
 void pdc_printf(const char *fmt, ...);
 
 void pdc_emergency_unlock(void);