bump(sys-kernel/coreos-kernel): Update to v3.14.4

- Drops aufs support!!
- Enables Areca SCSI/SATA driver, fixes issue #552

For easy reference here is the config diff:
```diff
--- x86_64_defconfig-3.14.1	2014-04-21 14:08:35.766116124 -0700
+++ x86_64_defconfig-3.14.4	2014-05-13 11:06:56.775097880 -0700
@@ -1,6 +1,6 @@
 #
 # Automatically generated file; DO NOT EDIT.
-# Linux/x86 3.14.1 Kernel Configuration
+# Linux/x86 3.14.4 Kernel Configuration
 #
 CONFIG_64BIT=y
 CONFIG_X86_64=y
@@ -1397,7 +1397,7 @@
 # CONFIG_SCSI_MVUMI is not set
 # CONFIG_SCSI_DPT_I2O is not set
 # CONFIG_SCSI_ADVANSYS is not set
-# CONFIG_SCSI_ARCMSR is not set
+CONFIG_SCSI_ARCMSR=m
 # CONFIG_SCSI_ESAS2R is not set
 # CONFIG_MEGARAID_NEWGEN is not set
 # CONFIG_MEGARAID_LEGACY is not set
@@ -3077,21 +3077,6 @@
 # CONFIG_UFS_FS is not set
 # CONFIG_F2FS_FS is not set
 CONFIG_EFIVAR_FS=m
-CONFIG_AUFS_FS=y
-CONFIG_AUFS_BRANCH_MAX_127=y
-# CONFIG_AUFS_BRANCH_MAX_511 is not set
-# CONFIG_AUFS_BRANCH_MAX_1023 is not set
-# CONFIG_AUFS_BRANCH_MAX_32767 is not set
-CONFIG_AUFS_SBILIST=y
-# CONFIG_AUFS_HNOTIFY is not set
-# CONFIG_AUFS_EXPORT is not set
-# CONFIG_AUFS_RDU is not set
-# CONFIG_AUFS_SP_IATTR is not set
-# CONFIG_AUFS_SHWH is not set
-# CONFIG_AUFS_BR_RAMFS is not set
-# CONFIG_AUFS_BR_FUSE is not set
-CONFIG_AUFS_BDEV_LOOP=y
-# CONFIG_AUFS_DEBUG is not set
 CONFIG_NETWORK_FILESYSTEMS=y
 CONFIG_NFS_FS=m
 CONFIG_NFS_V2=m
```