Fixed out of sync definitions for set_frequency_registers() and scale_uint32()

This fixes this compile error:

```
make install
% install radio for hm_trp
CC radio/radio.c
radio/radio.c:1032: error 98: conflict with previous definition of 'scale_uint32' for attribute 'type'
from type 'unsigned-long-int function ( unsigned-long-int fixed, unsigned-long-int fixed) fixed'
  to type 'unsigned-long-int function ( unsigned-long-int pdata, unsigned-long-int pdata) fixed'
radio/radio.c:1082: error 98: conflict with previous definition of 'set_frequency_registers' for attribute 'type'
from type 'void function ( unsigned-long-int fixed) fixed'
  to type 'void function ( unsigned-long-int pdata) fixed'
make[1]: *** [obj/hm_trp/radio~hm_trp/radio.rel] Error 1
make: *** [install~radio~hm_trp] Error 2
```

With this SDCC version:

```
SDCC : mcs51/z80/z180/r2k/r3ka/gbz80/tlcs90/ds390/pic16/pic14/TININative/ds400/hc08/s08/stm8 3.4.0 #8981 (Aug 10 2014) (Mac OS X x86_64)
published under GNU General Public License (GPL)
```