Handle "hardware" bootconfig parameter as "androidboot.hardware"

The parameter "androidboot.hardware" has been removed from bootconfig
and replaced by "hardware" parameter.

Test: launch_cvd with 4.19 and 5.10 kernels
Test: atest CtsFsMgrTestCases
Bug: 173815685
Change-Id: I627426ae1bd0a165b70b8f2584ec184abfb4236f