common: cmd_ide: use __weak and add prototypes

clang chokes about the concept of having an alias to an
always_inlined function. gcc likely just ignores the always
inlined since binary sizes are equal before and after this
patch. Convert the aliases to weak functions and provide
missing prototypes.

cc: Pavel Herrmann <morpheus.ibis@gmail.com>
Signed-off-by: Jeroen Hofstee <jeroen@myspectrum.nl>
diff --git a/include/ide.h b/include/ide.h
index 0424d04..c2a48e0 100644
--- a/include/ide.h
+++ b/include/ide.h
@@ -66,12 +66,16 @@
 /*
  * I/O function overrides
  */
+unsigned char ide_inb(int dev, int port);
+void ide_outb(int dev, int port, unsigned char val);
 void ide_input_swap_data(int dev, ulong *sect_buf, int words);
 void ide_input_data(int dev, ulong *sect_buf, int words);
 void ide_output_data(int dev, const ulong *sect_buf, int words);
 void ide_input_data_shorts(int dev, ushort *sect_buf, int shorts);
 void ide_output_data_shorts(int dev, ushort *sect_buf, int shorts);
 
+void ide_led(uchar led, uchar status);
+
 /**
  * board_start_ide() - Start up the board IDE interfac
  *