add p1 to vendorsetup.sh (OG Galaxy Tab)

Device trees
p1 : https://github.com/sgt7/android_device_samsung_p1 (GSM)
p1c : https://github.com/sgt7/android_device_samsung_p1c (CDMA)
p1-common : https://github.com/sgt7/android_device_samsung_p1-common (common tree)

Kernel
p1 : https://github.com/sgt7/android_kernel_samsung_p1 (GSM & LTN)
p1c : https://github.com/jt1134/android_kernel_samsung_galaxytab-cdma (CDMA)

Going to merge the CDMA specific code into the GSM kernel soon

P1C review here : http://review.cyanogenmod.com/#change,13571

Change-Id: I2c63b079a05a7c4c39b2f3503c8a9e75e9dd26d9