payloads: Drop unneeded empty lines

Change-Id: I6faeb7c783052edc4217d2d301dbb905e1fc6a19
Signed-off-by: Elyes HAOUAS <ehaouas@noos.fr>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/44605
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Michael Niewöhner <foss@mniewoehner.de>

payloads/libpayload/include/libpayload.h

@@ -456,7 +456,6 @@ static inline int log2(u32 x) { return (int)sizeof(x) * 8 - clz(x) - 1; }
 static inline int __ffs(u32 x) { return log2(x & (u32)(-(s32)x)); }
 /** @} */
 
-
 /**
  * @defgroup mmio MMIO helper functions
  * @{
@@ -475,7 +474,6 @@ static inline void buffer_to_fifo32(void *buffer, size_t size, void *fifo,
 #endif
 /** @} */
 
-
 /**
  * @defgroup hash Hashing functions
  * @{