tests: simplify BpfMap.reset(createMap()) -> BpfMap.resetMap()

BpfMap.reset(createMap()) is equivalent to newly added BpfMap.resetMap(),
except that the latter makes it impossible to screw up the Key/Value sizes.

Bug: 235286176
Test: TreeHugger
Signed-off-by: Maciej Żenczykowski <maze@google.com>
Change-Id: I290986e9ae8660f3fc6f73b086d33f4ab93d6095
(cherry picked from commit 439bac2e566eb8b52981a229e4be88a05b58149c)
Merged-In: I290986e9ae8660f3fc6f73b086d33f4ab93d6095
2 files changed