CONFIG_MPC7448HPC2 is not available for thedefaultarchitecture x86.
Result is shown for architecture powerpc

Freescale MPC7448HPC2(Taiga)

modulename: mpc7448_hpc2.ko

configname: CONFIG_MPC7448HPC2

Linux Kernel Configuration
└─>Freescale MPC7448HPC2(Taiga)
In linux kernel since version 2.6.20 (release Date: 2007-02-04)  
Select MPC7448HPC2 if configuring for Freescale MPC7448HPC2 (Taiga)
platform

source code: