Rename _rom_size to _load_size_sect, since hdprefix.S also uses it.

src/arch/i386/prefix/hdprefix.S

 	ljmp	$BOOT_SEG, $start_image
 
 load_length:
-	.long	_rom_size
+	.long	_load_size_sect
 max_sector:
 	.byte	0
 max_head:

src/arch/i386/prefix/romprefix.S

 	.org	0x00
 romheader:
 	.word	0xAA55			/* BIOS extension signature */
-romheader_size:	.byte	_rom_size	/* Size in 512-byte blocks */
+romheader_size:	.byte _load_size_sect	/* Size in 512-byte blocks */
 	jmp	init_vector		/* Initialisation vector */
 	.org	0x16
 	.word	undiheader
 	.byte	0x02			/* Device Base Type code */
 	.byte	0x00			/* Device Sub-Type code */
 	.byte	0x00			/* Device Interface Type code */
-pciheader_size:	.word	_rom_size	/* Image length same as offset 02h */
+pciheader_size:	.word _load_size_sect	/* Image length same as offset 02h */
 	.word	0x0001			/* revision level of code/data */
 	.byte	0x00			/* code type */
 	.byte	0x80			/* Flags (last PCI data structure) */

src/arch/i386/scripts/i386-kir.lds

     _text16_size_pgh	= ( ( _text16_size + 15 ) / 16 );
     _data16_size_pgh	= ( ( _data16_size + 15 ) / 16 );
     _load_size_pgh	= ( ( _load_size + 15 ) / 16 );
-    _rom_size		= ( ( _load_size + 511 ) / 512 );
+    _load_size_sect	= ( ( _load_size + 511 ) / 512 );
 }

src/arch/i386/scripts/i386.lds

     _text16_size_pgh	= ( ( _text16_size + 15 ) / 16 );
     _data16_size_pgh	= ( ( _data16_size + 15 ) / 16 );
     _load_size_pgh	= ( ( _load_size + 15 ) / 16 );
-    _rom_size		= ( ( _load_size + 511 ) / 512 );
+    _load_size_sect	= ( ( _load_size + 511 ) / 512 );
 }