SFDP: unit tests: Move unshared test data into case

Some test data in test_sfdp.cpp is used by one test case only, so
we turn it into a local variable.

Author: LDong-Arm

storage/blockdevice/tests/UNITTESTS/SFDP/test_sfdp.cpp

@@ -39,26 +39,6 @@ static const uint8_t sector_map_single_descriptor[] {
     0xF4, 0xFF, 0xFB, 0x03      // region 2
 };
 
-/**
- * Based on Cypress S25FS512S, modified to have one descriptor,
- * twelve regions for test purpose.
- */
-static const uint8_t sector_map_single_descriptor_twelve_regions[] {
-    0xFF, 0x01, 0x0B, 0xFF,     // header, highest region = 0x0B
-    0xF1, 0x7F, 0x00, 0x00,     // region 0
-    0xF4, 0x7F, 0x03, 0x00,     // region 1
-    0xF4, 0xFF, 0xFB, 0x03,     // region 2
-    0xF1, 0x7F, 0x00, 0x00,     // region 3
-    0xF4, 0x7F, 0x03, 0x00,     // region 4
-    0xF4, 0xFF, 0xFB, 0x03,     // region 5
-    0xF1, 0x7F, 0x00, 0x00,     // region 6
-    0xF4, 0x7F, 0x03, 0x00,     // region 7
-    0xF4, 0xFF, 0xFB, 0x03,     // region 8
-    0xF1, 0x7F, 0x00, 0x00,     // region 9
-    0xF4, 0x7F, 0x03, 0x00,     // region 10
-    0xF4, 0xFF, 0xFB, 0x03,     // region 11
-};
-
 class TestSFDP : public testing::Test {
 
 public:
@@ -270,6 +250,26 @@ TEST_F(TestSFDP, TestSFDPReadFailure)
  */
 TEST_F(TestSFDP, TestMoreRegionsThanSupported)
 {
+    /**
+     * Based on Cypress S25FS512S, modified to have one descriptor,
+     * twelve regions for test purpose.
+     */
+    const uint8_t sector_map_single_descriptor_twelve_regions[] {
+        0xFF, 0x01, 0x0B, 0xFF,     // header, highest region = 0x0B
+        0xF1, 0x7F, 0x00, 0x00,     // region 0
+        0xF4, 0x7F, 0x03, 0x00,     // region 1
+        0xF4, 0xFF, 0xFB, 0x03,     // region 2
+        0xF1, 0x7F, 0x00, 0x00,     // region 3
+        0xF4, 0x7F, 0x03, 0x00,     // region 4
+        0xF4, 0xFF, 0xFB, 0x03,     // region 5
+        0xF1, 0x7F, 0x00, 0x00,     // region 6
+        0xF4, 0x7F, 0x03, 0x00,     // region 7
+        0xF4, 0xFF, 0xFB, 0x03,     // region 8
+        0xF1, 0x7F, 0x00, 0x00,     // region 9
+        0xF4, 0x7F, 0x03, 0x00,     // region 10
+        0xF4, 0xFF, 0xFB, 0x03,     // region 11
+    };
+
     mbed::sfdp_hdr_info header_info;
     set_sector_map_param_table(
         header_info.smptbl,