AVRCP: Fix getFolderItems with all items request

start item and end item are uint32_t
0xFFFFFFFF is commonly used as an indicator for "all items" end value.

Using a jint (int32_t) doesn't work, use jlong instead.

Test: browse with audi kit
Bug: 35385700
Bug: 36645066
Change-Id: I364f70a8b985796a6bcc83148a4ecc368a0c0493