Blocking MTP in SEPM we need to know device id or class id for the android. Here is the link , there are many android device id available which can help you to block MTP.
Also if you are using windows8/windows7 or later you can block all MTP using group policy.
http://developer.android.com/tools/device.html
http://webcache.googleusercontent.com/search?q=cac...
Acer USB\VID_0502*
ASUS USB\VID_0b05
Dell USB\VID_413c
Foxconn USB\VID_0489
Fujitsu USB\VID_04c5
Fujitsu Toshiba USB\VID_04c5
Garmin-Asus USB\VID_091e
Google USB\VID_18d1
Haier USB\VID_201E
Hisense USB\VID_109b
HTC USB\VID_0bb4
Huawei USB\VID_12d1
Intel USB\VID_8087
K-Touch USB\VID_24e3
KT Tech USB\VID_2116
Kyocera USB\VID_0482
Lenovo USB\VID_17ef
LG USB\VID_1004
Motorola USB\VID_22b8
MTK USB\VID_0e8d
NEC USB\VID_0409
Nook USB\VID_2080
Nvidia USB\VID_0955
OTGV USB\VID_2257
Pantech USB\VID_10a9
Pegatron USB\VID_1d4d
Philips USB\VID_0471
PMC-Sierra USB\VID_04da
Qualcomm USB\VID_05c6
SK Telesys USB\VID_1f53
Samsung USB\VID_04e8
Sharp USB\VID_04dd
Sony USB\VID_054c
Sony Ericsson USB\VID_0fce
Sony Mobile Communications USB\VID_0fce
Teleepoch USB\VID_2340
Toshiba USB\VID_0930
ZTE USB\VID_19d2
Micromax USB\VID_0BB*
Sony COMP\SONY*
Nokia USB\VID_042*
Apple USB\VID_05AC*