scsi: aic7xxx: Fix build 'aicasm' warning

When building with CONFIG_AIC7XXX_BUILD_FIRMWARE=y or
CONFIG_AIC79XX_BUILD_FIRMWARE=y, the warning messages are as follows:

  aicasm_gram.tab.c:1722:16: warning: implicit declaration of function
    ‘yylex’ [-Wimplicit-function-declaration]

  aicasm_macro_gram.c:68:25: warning: implicit declaration of function
    ‘mmlex’ [-Wimplicit-function-declaration]

  aicasm_scan.l:417:6: warning: implicit declaration of function
    ‘mm_switch_to_buffer’

  aicasm_scan.l:418:6: warning: implicit declaration of function
    ‘mmparse’

  aicasm_scan.l:421:6: warning: implicit declaration of function
    ‘mm_delete_buffer’

The solution is to add the corresponding function declaration to the
corresponding file.

Signed-off-by: wangdicheng <wangdicheng@kylinos.cn>
Signed-off-by: huanglei <huanglei@kylinos.cn>
Link: https://lore.kernel.org/r/20241206071926.63832-1-wangdich9700@163.com
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>

Author: wangdicheng

drivers/scsi/aic7xxx/aicasm/aicasm_gram.y

@@ -102,6 +102,7 @@ static void add_conditional(symbol_t *symbol);
 static void add_version(const char *verstring);
 static int  is_download_const(expression_t *immed);
 static int  is_location_address(symbol_t *symbol);
+int yylex();
 void yyerror(const char *string);
 
 #define SRAM_SYMNAME "SRAM_BASE"

drivers/scsi/aic7xxx/aicasm/aicasm_macro_gram.y

@@ -61,6 +61,7 @@
 static symbol_t *macro_symbol;
 
 static void add_macro_arg(const char *argtext, int position);
+int mmlex();
 void mmerror(const char *string);
 
 %}

drivers/scsi/aic7xxx/aicasm/aicasm_scan.l

@@ -64,6 +64,9 @@ static char *string_buf_ptr;
 static int  parren_count;
 static int  quote_count;
 static char buf[255];
+void mm_switch_to_buffer(YY_BUFFER_STATE);
+void mmparse();
+void mm_delete_buffer(YY_BUFFER_STATE);
 %}
 
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