ide-cd: move VERBOSE_IDE_CD_ERRORS code to ide-cd_verbose.c

* Rename ide-cd kernel module to ide-cd_mod in preparation to moving code out
from ide-cd.[c,h]. Add MODULE_ALIAS("ide-cd") to preserve compatibility.

* Move VERBOSE_IDE_CD_ERRORS code from ide-cd.[c,h] to ide-cd_verbose.c.

ide-cd_verbose.c is IDE subsystem independent and may be easily converted into generic library usable by other drivers (i.e. libata) if needed.

* Add CONFIG_BLK_DEV_IDECD_VERBOSE_ERRORS config option to drivers/ide/Kconfig replacing VERBOSE_IDE_CD_ERRORS define. Make this config option enabled by default and visible only if CONFIG_EMBEDDED is defined.

before the patch:
text data bss dec hex filename
22841 360 1056 24257 5ec1 drivers/ide/ide-cd.o

after the patch w/ CONFIG_BLK_DEV_IDECD_VERBOSE_ERRORS=y:
text data bss dec hex filename
22857 360 1056 24273 5ed1 drivers/ide/ide-cd_mod.o

after the patch w/ CONFIG_BLK_DEV_IDECD_VERBOSE_ERRORS=n:
text data bss dec hex filename
15091 360 1056 16507 407b drivers/ide/ide-cd_mod.o

---
 drivers/ide/Kconfig          |    9 +
 drivers/ide/Makefile         |    4 
 drivers/ide/ide-cd.c         |  124 --------------
 drivers/ide/ide-cd.h         |  237 ----------------------------
 drivers/ide/ide-cd_verbose.c |  359 +++++++++++++++++++++++++++++++++++++++++++
 5 files changed, 375 insertions(+), 358 deletions(-)

Index: b/drivers/ide/Kconfig
===================================================================
@@ -206,6 +206,15 @@ config BLK_DEV_IDECD
 	  To compile this driver as a module, choose M here: the
 	  module will be called ide-cd.
 
+config BLK_DEV_IDECD_VERBOSE_ERRORS
+	bool "Verbose error logging for IDE/ATAPI CDROM driver" if EMBEDDED
+	depends on BLK_DEV_IDECD
+	default y
+	help
+	  Turn this on to have the driver print out the meanings of the
+	  ATAPI error codes.  This will use up additional 8kB of kernel-space
+	  memory, though.
+
 config BLK_DEV_IDETAPE
 	tristate "Include IDE/ATAPI TAPE support (EXPERIMENTAL)"
 	depends on EXPERIMENTAL

Index: b/drivers/ide/Makefile
===================================================================
@@ -40,8 +40,10 @@ obj-$(CONFIG_BLK_DEV_IDEPNP)		+= ide-pnp
 obj-$(CONFIG_IDE_H8300)			+= h8300/
 obj-$(CONFIG_IDE_GENERIC)		+= ide-generic.o
 
+ide-cd_mod-y += ide-cd.o ide-cd_verbose.o
+
 obj-$(CONFIG_BLK_DEV_IDEDISK)		+= ide-disk.o
-obj-$(CONFIG_BLK_DEV_IDECD)		+= ide-cd.o
+obj-$(CONFIG_BLK_DEV_IDECD)		+= ide-cd_mod.o
 obj-$(CONFIG_BLK_DEV_IDETAPE)		+= ide-tape.o
 obj-$(CONFIG_BLK_DEV_IDEFLOPPY)		+= ide-floppy.o