修复了在rodata为空时，启动挂死的bug

合入 2e8cff0a0eee87b2补丁后 
rodata=
/ # dmesg | grep rodata
[ 0.000000] Invalid option string for rodata: ''
[ 0.000000] rodata=
[ 0.000000] Memory: 8100228K/8388608K available (14400K kernel code, 2922K rwdata, 7780K rodata, 5888K init, 533K bss, 255612K reserved, 32768K cma-reserved)

rodata

/ # dmesg | grep rodata
[ 0.000000] Invalid option string for rodata: '(null)'
[ 0.000000] rodata
[ 0.000000] Memory: 8100228K/8388608K available (14400K kernel code, 2922K rwdata, 7780K rodata, 5888K init, 533K bss, 255612K reserved, 32768K cma-reserved)

rodata = full
/ # dmesg | grep rodata
[ 0.000000] rodata=full
[ 0.000000] Memory: 8100228K/8388608K available (14400K kernel code, 2922K rwdata, 7780K rodata, 5888K init, 533K bss, 255612K reserved, 32768K cma-reserved

rodata=on
[ 0.000000] rodata=on
[ 0.000000] Memory: 8100228K/8388608K available (14400K kernel code, 2922K rwdata, 7780K rodata, 5888K init, 533K bss, 255612K reserved, 32768K cma-reserved)

rodata=off

/ # dmesg | grep rodata
[ 0.000000] rodata=off
[ 0.000000] Memory: 8100228K/8388608K available (14400K kernel code, 2922K rwdata, 7780K rodata, 5888K init, 533K bss, 255612K reserved, 32768K cma-reserved)

rodata=of

/ # dmesg | grep rodata
[ 0.000000] Invalid option string for rodata: 'of'
[ 0.000000] rodata=of
[ 0.000000] Memory: 8100228K/8388608K available (14400K kernel code, 2922K rwdata, 7780K rodata, 5888K init, 533K bss, 255612K reserved, 32768K cma-reserved)

GVP openEuler/kernel

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GVPopenEuler/kernel

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