app: aboot: increase display kernel command line size
app: aboot: increase display kernel command line size

64 bytes length is not enough to store the dual DSI
panel argument at kernel command line. It should be
128 bytes for such panels.

Change-Id: I7fd4a47f81066834d516fab0b94496fd29420bba

lg-devs/g2-bootloader,mozilla-b2g/fairphone2_kernel_lk,t2m-foxfone/android_kernel_lk,lg-devs/g2-bootloader,mozilla-b2g/fairphone2_kernel_lk,lg-devs/g2-bootloader,mozilla-b2g/fairphone2_kernel_lk,idor/dk50-bootable_bootloader_lk,t2m-foxfone/android_kernel_lk,lg-devs/g2-bootloader,idor/dk50-bootable_bootloader_lk,idor/dk50-bootable_bootloader_lk,mozilla-b2g/fairphone2_kernel_lk,mozilla-b2g/fairphone2_kernel_lk,idor/dk50-bootable_bootloader_lk,idor/dk50-bootable_bootloader_lk,t2m-foxfone/android_kernel_lk,t2m-foxfone/android_kernel_lk,t2m-foxfone/android_kernel_lk,lg-devs/g2-bootloader