Skip file casefold test for filesystem does not support casefold

For android Q upgrading device, lunch with kernel before 5.2, casefold
does not support.Skip these tests.

Bug: 328169293
Bug: 324353500
Bug: 328323997
Test: atest CtsAppSecurityHostTestCases
            CtsProviderTestCases

Signed-off-by: yidong zhang <yidong.zhang@amlogic.com>

Change-Id: I2be8543f0baf81afd48fe0740a8e8e0d668211ad