ANDROID: cpufreq: times: allocate enough space for a uid_entry

since the variable called uid_entry is a pointer, need to use
sizeof(*uid_entry) to allocate enough space for a full uid_entry
struct.

Bug: 74338318
Change-Id: I488a7cab849398ef7b1f4712b7746f8cf645209d
Signed-off-by: Connor O'Brien <connoro@google.com>