make cardCommand public

Author: danielkucera

src/utility/Sd2Card.h

@@ -241,6 +241,7 @@ class Sd2Card {
     uint8_t writeStart(uint32_t blockNumber, uint32_t eraseCount);
     uint8_t writeStop(void);
     uint8_t isBusy(void);
+    uint8_t cardCommand(uint8_t cmd, uint32_t arg);
   private:
     uint32_t block_;
     uint8_t chipSelectPin_;
@@ -255,7 +256,6 @@ class Sd2Card {
       cardCommand(CMD55, 0);
       return cardCommand(cmd, arg);
     }
-    uint8_t cardCommand(uint8_t cmd, uint32_t arg);
     void error(uint8_t code) {
       errorCode_ = code;
     }