Revert "staging: r8188eu: Add support for Dlink DWA-121 802.11n Wireless N 150 Pico Adapter"

This reverts commit 599a2c02.

Larry writes:
	This patch should be dropped. The 0x2001:0x3308 device is an
	RTL8188CU, not RTL8188EU. As a result, it is already in the USB
	device tables.

Cc: Larry Finger <Larry.Finger@lwfinger.net>
Cc: Kim Nylund <kim@pratsam.com>
Cc: stable <stable@vger.kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>